1. Getting less than 3 tails
a) 9/10 b) 4/5 c) 2/3 d) 3/20
5. All heads
a) 41/100 b) 17/50 ) 3/20 d) 1/20
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probability of getting less than 3 tails is=(200-20)/200
=180/200
=9 /10
probability of getting all heads is =30/200
= 3/20
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